Answer:
c. (y + z = 6) ⋅ -3
Step-by-step explanation:
Equation P : y + z = 6
Equation Q : 3y + 4z = 1
In order to solve by elimination and remove the y-term, the coefficients of y must be same or negative to each other in both the equations.
So to make the y co-efficient similar here, multiply the first equation by -3
When done: (y + z = 6) · -3 = -3y - z = -18
Solving steps:
-3y - 3z = -18
3y + 4z = 1
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z = -17
There the y-term has been removed.